The Mann Cup is the trophy awarded to the senior men’s lacrosse champions of Canada. The championship series is played between the Western Lacrosse Association champion and the Major Series Lacrosse champion.[1] The trophy is one of the most valuable trophies in all of sports, made of solid gold and valued at $25,000.

It was donated in 1910 by Sir Donald Mann; prior to then, the Minto Cup was the senior amateur championship trophy. The Mann Cup was originally a challenge trophy, but in 1925 the champion New Westminster Salmonbellies turned the trophy over to the Canadian Lacrosse Association who instituted a national playoff system. The challenges and championships for the Mann Cup were played by the rules of traditional field lacrosse until 1932, when box lacrosse was adopted by the Canadian Lacrosse Association. The first indoor Mann Cup was played at Maple Leaf Gardens in Toronto in October 1932.

I’m pretty sure that the first Mann Cup awarded was the 1910 title won by the Young Torontos. (hey just noticed, it’s the hundredth anniversary). The 1901 to 1909 winners on your listing were actually the Minto Cup winners (Salmonbellies, Shamrocks & Capitals), which was actually contested for by senior/professional teams in those days. Cheers.